Dental motor.



Patented June [2, I900.

No. 65l,469.

' U. H. & A. F. PIEPER.

2 Sheets-Sheet I.

(No Model.)

0. H. & A. F. PlEPE-R. Patented DENTAL. MOTOR. (Application filed Mar.1, 1900.;

2 Sheets-Sheet 2.

(No Model.)

' l i'TED STATES OSCAR H. PIEPER AND ALPHONSE PATENT O FFICE.

PIEPER, OF ROCHESTER, NElV YORK.

DENTAL MOTOR.

SPECIFICATION formingpart of Letters Iatent No. 651,469, dated d'uli 12,1906. Application filed Mar hll 1900.: Serial No. 7,002. (No model.)

To all whom it may concern:

Be it known that we, OSCAR H. Pierce and ALPHONSE F. PIEPER,OfRochester,New York, have invented certain new and useful Im;

provements in Dental Motors; and we do hereby declare the following tobe a full, clear, and exact description of the same, reference being hadto the accompanying drawings, forming a part of this specification, andto [o the reference-numerals marked thereon.

Our present invention relates to motors,par-' ticularly for operatingsmall hand-tools, such as used by dentists, which are manipulated by theoperator to grind, drill, or polish and are therefore necessarilycapable of universal movement to operate in the most convenient manner;and it has for its object to prof vide means whereby the motor may besup: ported in convenient manner and all the neozo essary movements maybe given the tool or handpiece and the latter held within conven: ientreach of the operator atall times.

To these ends the invention consists in certain improvements andcombinations of parts,

2 5 all as will be hereinafter fully described, the novel features beingpointed out in the claims at the end of this specification.

In the drawings, Figure 1 is a perspective view of a motor and connectedparts; Fig. 2, a sectional view on the line a a of Fig. 1; Fig.

3, a sectional view on the line b b of Fig. 2; Fig. 4, a sectionalviewonthe line 0 c of Fig. 5; Fig. 5, a sectional view on the line d dof Fig. 4; Fig. 6, a sectional view on the line e e 3 5 of Fig. 4. Y

Similar reference-numerals in the several figures indicate similarparts.

We have shown our invention as applied to a motor operated byelectricity and prefer this by reason of the simplicity and facility ofconnection and operation, although any other suitable motor could beemployed embodying a casing capable of being supported in the samemanner.

In devices of this general description it is desirable to support themotor or tool-operatin g device in such relation to the dental chairthat the tool or handpiece may be within convenient reach of theoperator and at the same time be normally held out of his way, and wetherefore attach the main holding bracket or support 1 to a stationarysupport 2, which maybe the wall of the room or a standard especiallyprovided for thepurpose. This bracket orsupport 1 preferably embodies abase OI Plateprovided with two horizontallyextending arms 3, inwhich themotor-frame i is journaled to swing laterally on a vertical center. Themotor may be of any suitable construction; butwe prefer to employ anelectric motor, such asshown, the annular frame'4 of which constitutes amagnet composed of plates clamped between rings 17, provided withpole-pieces 15, having coils 16 thereon, and between which rotates anarmature 5 on a shaft or arbor 6, journaled in a bearing-yoke 66 at oneend and at the other in a bearing in a tubular extension 7, supportedmediately on a casing or cover-plate 8. The motor-frame tis provided attop and bottom with blocks of non-resonant material,

the rings are metal bearing-collars 11, adapted to rotate freely in theapertures in the vertically-arranged arms 3, whereby the mo tor may turnfreely on a vertical axis, while the rubber blocks relieve the supportfrom jar and deaden the sound when the motor is in operation. One sideof the motor is covered by the hemispherical plate 12, secured bya nut13 on the armature-arbor yoke 66, a felt washer being interposed betweenthe parts, and a larger washer or packing-ring 14:, provided between thelarger end of the cover and the annular frame, prevents the entrance ofdust and deadens the sound. The side of the motor-frame opposite theyoke is provided with the coverplate 8, having the tubular extension 7formed or secured at the center thereof, said plate 8 being secured tothe magnet-ring 17 by screws 18 or otherwise. A suitable felt washer 19is arranged between the edge of the plate 8 and themaguet to excludedust and deaden the sound. Surrounding-the armature-arbor is abearing-sleeve or bushing 20, secured in the extension 7, which latterisslotted or cored out, the lower sides of the lower slots being inclinedtoward an oil-cup 23, from which oil or lubricating material is suppliedto the bearing by a wick 22, extending into the oil-cup on the lowerside of the such as soft-rubber blocks or packing-rings 9, secured byheaded screws 10, and around extension 7,.as shown in Fig. 4. Theinclined slots or recesses serve to return to the oilcup any oilescaping at the ends of the bearing.

2& indicates a split collar adjustably clamped by a screw 25 upon theouter reduced portion of the extension 7 and provided with a flange 26,between which and a collar 27 is arranged a disk 28, formed with orcarrying a radius arm or bar 29. The collars 24 and 27 are preventedfrom movement longitudinally of the extension by a screw 30, passingthrough the collar 27 and entering an annular groove 31, as shown inFigs. 4am 5.

2 indicates a belt-pulley on the end of the armature-shaft, from whichpower is communicated by a belt 33 to the tool 45.

The disk 28,wh-ich is, in elfect, a part of the radius-arm, turns on acenter concentric with the driving-shaft of the motor andis providedwith a pin 34, to which is connected one end of a volute spring 35, theother end of the latter being connected to the collar'24i by entering arecess therein, whereby the spring will tend to raise the radius-arm 29and hold itagainst the uppermost of a pair of stop-pins 36 on the plate8, although the arm may be moved downwardly against the tension of thespring when desired. The spring serves to slightly more thancounterbalance the radiusarm and connected parts, so'as to permit freemovement with very slight exertion, :but to return the arm to upperposition when the tool is released.

57 indicates a bracket hinged at 38 to the upper end of the radius-arm29 and provided with belt-pulleys39, over which the belt 33 passes, saidpulleys being loose upon an arbor 40,asshown in Fig. 2, and 37 is an armor rod connected to the bracket, so as to turn axially therein. At thelower end of the arm 37 is provided a loose guide-pulley 41 and also apivoted handpiece 42, having a guide-pulley and a tool-shaft 43, to oneend of which 'latter a driving-pulley 44 is connected and at the otherend a tool 45, as shown. The par-. ticularstructure of the arm 37,the-handpiece, and the connected parts form no part ofour presentinvention, the construction shown being similar to a universally-movablehandtool now on the market, and these parts may be *of any suitable ordesired construction, it being sufficient that thedriving-beltextending'from the pulley 32 to the pulley 42L on the tool-shaft in thehandpiece be kept reasonably taut, the tool effectively driven, and auniversal adjustment permitted the handpiece. When the hand piece is notin use, the

arnr37 is engaged by a hook 46on an arm a7,

ad'gjustably secured to the radius-M11129, as

shown in Fig. 1, out of the way of the operator, but within convenientreach.

The current for operating the motor may be supplied through suitableflexible conductors 50, entering the frame through the coveri plate 8,as shown in Fig. 1, or any other power could be employed in any othermanner that would notprevent the free movements neces sary.

The motors, constructed and supportedas described, being centrallypivoted occupy but little room, are permitted a free movement on avertical axis, and the radius-arm 29 and connected parts, while normallysupported and held against the stop 36 by the spring, (which latterserves to slightly more than counterbalance the weight of the parts,)can be moved by the manipulation of the handpiece into any position toaccomplish the work desired in the most convenient manner, the latterbeing permitted a universal movement, as will be understood.

We claim as our inventiona 1. The combination with thesupportingbracket, the motor-frame pivoted at topand bottom to thebracket to swing in a horizontal plane, and having the tubularextensionand the shaft operating in the extension, of the radius-arm movablearound the extension, and-the spring connected tothe extension and armfor elevating the latter.

2. The combination with the motor-casing having the tubular extension atthe side,and the rotary shaft operating in the extension, of theradius-arm movable around the extension, and the spring connected to theextension and arm for elevating the latter.

3. The combination with the 1notor-casing having the tubularextensionatthe side, and the rotary shaft operating therein, of the sleeveadjustably secured upon the'extension, theradius-arm pivoted uponthesleeve, and the spring connected to thesleeveand arm for supportingthe latter.

4:. The combination with the motor-casing section provided withthetubular extension and the stops, and the rotaryshaft operating in theextension, of the sleeve on the extension, the radius-arm thereonoperating 'between the stops, and the spring connected to the sleeve andarm for holding the latter in engagement with the upper stop.

5. The combination with a support, the=an= nular motor-frame having thepivots at top and bottom journaledin thesupport, and the tubularextension at the side, of the rotary shaft operating in the extensionhaving the belt-pulley, the radius-arm turning on the-extension, and thespring for raising said arm.

6. The combination with the supportingbracket having the perforatedarms, of the motor arranged to turn between said arms having theoppositely-arranged flanged blocks of non-resonant material securedthereto and the flanged bearing collars fitting around the blocksarranged to turn i'nthe perforations in the bracket-arms.

7. The combinationwith the supportingbracket 'having the horizontal armsprovided 'with vertical perforati0ns,of the=motor-frame arranged betweensaid arms and provided with the flanged blocksof non-resonant maportingit, the arm connected to the free end of the radius arm, a handpiececonnected thereto, a rotary shaft in the handpiece, a belt extendingfrom themotor-pulley and to the r 5 handpiece, and guide-pulleys for thebelt.

OSCAR H. PIEPER. ALPHONSE F. PIEPER.

F. F. CHURCH,

Witnesses:

G. WILLARD RICH.

